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1. Re: [RFI] ethernet EMI revisited - questions for the pros (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sat, 22 Nov 2008 01:35:16 -0600 (CST)
I just got done taking care of my in home ethernet, a number of runs at 10, 100 and 1000 made for alot of noise. Some of the noise can be from poorly made cables. Many cheap jumpers that come with ge
/archives//html/RFI/2008-11/msg00045.html (12,512 bytes)

2. Re: [RFI] 40m dsl modem update (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sat, 14 Feb 2009 02:44:16 -0600 (CST)
ADSL2+ operates at up to 2.25Mhz, telephone RFI filters often cover down into this range. In my case, underground service but space limited (all antennas < 50 feet from telephone cabling, primary < 3
/archives//html/RFI/2009-02/msg00094.html (9,420 bytes)

3. [RFI] Grounding system improvements, looking for comments (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sun, 22 Feb 2009 00:40:50 -0600 (CST)
As we all know, a grounding system is not a magik blackhole into which RF vanishes, but the lower the RF impedance the better. I need to do some drainage improvements in my crawlspace, running a fair
/archives//html/RFI/2009-02/msg00105.html (7,348 bytes)

4. Re: [RFI] DSL Filter Update (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sun, 8 Mar 2009 18:05:38 -0500 (CDT)
Keep in mind that ADSL2+ has signaling up to 2.2Mhz, and that the default S/N threshold to use a channel is normally 6 - 9 db (default varies between DSLAM vendor/model, providers tune based on cable
/archives//html/RFI/2009-03/msg00016.html (8,710 bytes)

5. Re: [RFI] DSL Filter Update (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sun, 8 Mar 2009 20:34:36 -0500 (CDT)
Yes, you did. I was just providing a bit more specific info as to the effect. I think I have already covered that in several postings. Of course the filter is a considerable compromise in a number of
/archives//html/RFI/2009-03/msg00020.html (10,564 bytes)

6. Re: [RFI] DSL Filter Update (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sun, 8 Mar 2009 20:43:14 -0500 (CDT)
Depends on the DSL gear, ADSL1 cuts off around 1.1, VHDSL uses much higher freqs. Common use these days in the US is ADSL2+, with ADSL1 hardware cycling out of production. Also, remember that RF can
/archives//html/RFI/2009-03/msg00021.html (9,433 bytes)

7. Re: [RFI] DSL Filter Update (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Mon, 9 Mar 2009 14:40:12 -0500 (CDT)
DSLAM: Digital Subscriber Line Access Multiplexer (Terminates the upstream side of the DSL line, 24, 48 and 512 port chassis are common. Back side of the DSLAM will normally be ethernet or ATM depend
/archives//html/RFI/2009-03/msg00024.html (12,156 bytes)

8. Re: [RFI] DSL Filter Update (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Tue, 10 Mar 2009 03:26:36 -0500 (CDT)
Looking at the online site, the final impedance cure charts that show 1 2 and 3 turns and figuring from there. I am using the 2.4 in for coax, for the phoneline and DSL on the small cores they are wr
/archives//html/RFI/2009-03/msg00027.html (12,059 bytes)

9. Re: [RFI] Ignition Noise in 04 Vitara (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Wed, 24 Jun 2009 22:19:24 -0500 (CDT)
Some folks talk about using conductive tape over the COP housing. If I were going to bother (high labor investment) I would use adhesive back copper foil shielding tape. As I understand it, the adhes
/archives//html/RFI/2009-06/msg00057.html (9,207 bytes)

10. [RFI] Looking for ideas about yet another noise source (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sat, 11 Jul 2009 02:44:11 -0500 (CDT)
Attempting to track down a bothersome very intermittant noise and looking for some ideas. Don't have a decent way to record it, but may need to set something up if I cannot make headway. Noise is pul
/archives//html/RFI/2009-07/msg00000.html (7,002 bytes)

11. Re: [RFI] RFI Digest, Vol 79, Issue 2 (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sat, 11 Jul 2009 16:31:19 -0500 (CDT)
Yes, station runs off battery with float charger disconnected from wall. Have not done a shutdown specific to tracking down this one but have noted it multiple times while doing a circuit by circuit
/archives//html/RFI/2009-07/msg00002.html (10,823 bytes)

12. Re: [RFI] Looking for ideas about yet another noise source (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sun, 12 Jul 2009 02:33:05 -0500 (CDT)
I have a Grundig SW rig, but I find the HT (wideband receive w/ AM) with a step attenuator and a small shielded loop to be more useful. Also have a simple coax faraday pickup for in close. The issue
/archives//html/RFI/2009-07/msg00004.html (11,572 bytes)

13. [RFI] FOUND! - Looking for ideas about yet another noise source (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Mon, 27 Jul 2009 00:51:24 -0500 (CDT)
So, as some suggested it was static discharge, just _not_ on any of my antennas. I still have no idea where the apparent modulation on 20M comes in, I discounted it being an AGC artifact because mult
/archives//html/RFI/2009-07/msg00036.html (12,036 bytes)

14. Re: [RFI] FOUND! - Looking for ideas about yet another noise source (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Mon, 27 Jul 2009 20:51:00 -0500 (CDT)
Yep, 300 foot plus longwire was well insulated, with least insulated point being the approx 1/8 inch gap between the centerpin and body/nut of the RCA thru-chassis antenna jack. The last 100 feet or
/archives//html/RFI/2009-07/msg00039.html (10,318 bytes)

15. [RFI] How much RF does your power company deliver along with the AC? (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Fri, 21 Aug 2009 13:15:20 -0500 (CDT)
Had an interesting opportunity last night. Station is currently an Icom 756PROIII with an inverted L like (30ft vertical, 50ft to the side fed at the base through a SGC-237 autocoupler), and a 20M di
/archives//html/RFI/2009-08/msg00012.html (10,301 bytes)

16. Re: [RFI] How much RF does your power company deliver along with the AC? (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Fri, 21 Aug 2009 21:44:29 -0500 (CDT)
Perhaps I did not state things as clearly as they could have been, but you may want to re-read my original message. 2 Antennas about 40 feet apart, the dipole about 10 feet from the closest AC wiring
/archives//html/RFI/2009-08/msg00019.html (15,057 bytes)

17. Re: [RFI] How much RF does your power company deliver along with the AC? (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Fri, 21 Aug 2009 22:50:39 -0500 (CDT)
Jim, I do have noise on both hot, neutral (AC grounded conductor) an by extension AC ground (AC grounding conductor). This can be easily detected with a small coupling loop from any of the AC wiring
/archives//html/RFI/2009-08/msg00020.html (11,131 bytes)

18. Re: [RFI] How much RF does your power company deliver along with the AC? (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sat, 22 Aug 2009 18:22:49 -0500 (CDT)
Since the shack is battery run, disconnecting the charger and the shack gnding bus connection to the shack ground and the external antenna removes _all_ connections to anything. Running the radio str
/archives//html/RFI/2009-08/msg00022.html (11,768 bytes)

19. Re: [RFI] How much RF does your power company deliver along with the AC? (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sat, 22 Aug 2009 20:48:54 -0500 (CDT)
My work involves (indirectly) alot of power work, so I have a better than normal understanding of residential AC for a non sparky. AC entrance is opposite side of the house from the shack, 200 amp se
/archives//html/RFI/2009-08/msg00024.html (12,614 bytes)

20. Re: [RFI] How much RF does your power company deliver along with the AC? (score: 1)
Author: "Christopher E. Brown" <cbrown@woods.net>
Date: Sun, 23 Aug 2009 03:09:31 -0500 (CDT)
About average, only real good thing is the area is marshy with a high water table, the soil below a foot or so is never dry. I have no unplanned paths, and the signal itself is weak, move away from t
/archives//html/RFI/2009-08/msg00026.html (14,304 bytes)


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